Narfi, Betrayer King is one of the most interesting in that it is the Snow lord, pumping up all your other Snow creatures
It was a format-defining removal spell while in Standard, and Ive seen it dip into Modern decks from time to time, too
It should almost always make your deck (if its in your colors) and sends a strong signal that this color is open
Lastly, there are cards specifically built around this mechanic, like Thieving Varmint or Gonti, Canny Acquisitor, that easily let you cast spells you dont own
Austere Command is far less restrictive on your own build than other six mana mass removal
Iroh, Tea Master Iroh, Tea Master can hand out food or whatever you like, and service with a smile goes a long way when you play like a pai sho master